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JSON to TypeScript

Convert JSON samples to TypeScript interfaces with proper typing. The AI infers types from values, creates separate interfaces for nested objects, marks optional fields, and adds JSDoc comments — producing clean, production-ready TypeScript code.

JSON to TypeScript conversion generates TypeScript interfaces that exactly match a JSON object's structure — including nested types, arrays, optional fields, and union types — saving you from writing repetitive type definitions by hand.

Typing API responses for fetch callsCreating interfaces for config filesGenerating types from database result shapesDocumenting third-party API response structures

100% private — all processing runs in your browser. No files are uploaded to any server.

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Frequently Asked Questions

Does it handle deeply nested JSON?

Yes. Every nested object gets its own named interface, and arrays are properly typed as T[] or Array<T>.

How does it handle null values?

Null values are typed as T | null. Fields that appear optional in the sample are marked with ?.

Can I paste an array of objects?

Yes. Paste a JSON array and the AI generates the item interface plus the appropriate array type.

Does it generate Zod schemas too?

Use our JSON to Zod Schema tool for that. This tool focuses on clean TypeScript interfaces and type definitions.

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